ModGC

Fix YJIT version_map use-after-free #2404

Job	Run time
check (mmtk, release, macos-latest)	10m 46s
check (default, ubuntu-latest)	7m 59s
check (mmtk, release, ubuntu-latest)	10m 13s
check (default, macos-latest)	10m 48s
	39m 46s

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